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Chemistry Unit 8 2025 Review

Total questions: 54

Worksheet time: 6hrs 49mins

Name
Class
Date
1.
What is the first thing you must do to solve a stoichiometry problem?
a)
Write a Balanced Equation
b)
Panic
c)
Write an Unbalanced Equation
d)
Ask for help
2.

I use mole ratio (coefficients) from balanced chemical equation?

a)

True

b)

False

3.

I use molar mass when the problem gives me grams?

a)

False

b)

True

4.

How many step will it take for me to go from grams to moles unknown

a)

1

b)

2

c)

3

d)

4

5.

How many steps will it take me to go from grams to grams?

a)

4

b)

3

c)

2

d)

1

6.

How many step will it take for me to go from moles given to moles unknown?

a)

1

b)

2

c)

3

d)

4

7.
Mole ratios are obtained from the
a)
balanced chemical equation
b)
periodic table
c)
molar mass
8.

Given the equation:

2NaClO3 (s) → 2NaCl (s) + 3O2 (g)


When 2.00 moles of NaClO3 react, how many grams of O2 is produced?

a)

56 g of O2

b)

96 g of O2

c)

64 g O2

d)

32 g O2

9.

What numbers in a balanced equation do we use to determine mole ratios?

a)

Subscripts

b)

Superscripts

c)

Coefficients

10.

2 NaClO3 (s) → 2NaCl (s) +3 O2 (g)

How many grams of O2 will be produced from 12.00 moles of NaClO3?

a)

256 g of O2

b)

576 g of O2

c)

288 g O2

d)

32 g O2

11.

2Na + 2H2O → 2NaOH+ H2

How many grams of hydrogen are produced if 120 g of Na are available?

a)

5.27 g

b)

2.6 g

c)

690 g

d)

45 g

12.

2Al + 6HCl --> 2AlCl3 + 3H2

Aluminium reacts with hydrochloric acid. How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP?

a)

13

b)

8.8

c)

0.99

d)

1.0

13.
2CO  +  O2  −-> 2CO2
How many liters of carbon dioxide are produced from 10L of carbon monoxide?
a)
10
b)
20
c)
1
d)
5
14.

2H2 + O2 → 2H2O

How many grams of H2O can be produced from 3.91 g of O2?

a)

1.905

b)

4.4

c)

2.2

d)

1.1

15.
What is the molar mass of (NH4)2CO3 ?
a)
144 g
b)
138 g
c)
96 g
d)
78 g
16.

2Al + 3H2SO4 → Al2(SO4)3 + 3H2

How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?

a)

0.85 g

b)

290 g

c)

450 g

d)

870 g

17.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from  6 moles H2? 
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
18.

Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g)

How many moles of HCl are consumed in the production of 7.5 moles of MgCl₂?

a)

3.8 moles

b)

15 moles

c)

7.5 moles

d)

23 moles

19.

2KClO3 → 2KCl + 3O2

How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?

a)

6.7 mol

b)

1.0 mol

c)

10.1 mol

d)

4.5 mol

20.
2Na + 2H2O → 2NaOH+ H2
How many grams of hydrogen are produced if 120 g of Na are available?
a)
5.2 g
b)
2.6 g
c)
690 g
d)
45 g
21.

CH4 + 2 O2 → CO2 + 2 H2O

How many moles of carbon dioxide are produced from the combustion of 110 g of CH4?

a)

13.7 mol

b)

2.75 mol

c)

6.11 mol

d)

6.85 mol

22.
What is the empirical formula for the following:
Pb5Cr5O20
a)
Pb2Cr2O10
b)
PbCr2O7
c)
Pb9Cr4O2
d)
PbCrO4
23.
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
a)
Mg4N3
b)
MgN2
c)
Mg3N2 
d)
MgN
24.
Which of the following is considered an empirical formula?
a)
CH3COOH
b)
C6H12O6
c)
H2O
25.
You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.
a)
SO
b)
SO2
c)
SO3
d)
SO4
26.
A formula with the lowest whole # ratio of elements in a compound is called
a)
Molecular Formula
b)
Chemical Formula
c)
Empirical Formula 
d)
Distance Formula
27.
What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?
a)
CH2O
b)
C2H4O2
c)
C4H8O4
d)
C6H12O6
28.
What is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g.
a)
K2SO4 
b)
K8SO16
c)
K8S4O8 
d)
K8S4O16 
29.
What is the mass of 0.89 mol of CaCl2?
a)
111 grams
b)
0.008 grams
c)
98.9 grams
d)
none of the choices
30.

What is the mass of 3.35 moles of sulfur trioxide?

a)

335 g

b)

268 g

c)

245 g

d)

64 g

31.

What is the empirical formula for C4H6?

a)

CH

b)

CH3

c)

C2H3

d)

C4H6

32.

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

a)

SO

b)

SO2

c)

SO3

d)

SO4

33.

What is the empirical formula for N2S3?

a)

NS

b)

N3S2

c)

N2S3

d)

N1S1.5

34.

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

a)

NaPO2

b)

Na2PO3

c)

Na3PO4

d)

NaPO4

35.
What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?
a)
C3H8
b)
CH4
c)
C2H2
d)
C4H10
36.

Given the following, determine the empirical formula: 42.07% sodium, 18.89% phosphorus, and 39.04% oxygen.

a)

NaPO2

b)

Na2PO3

c)

Na3PO4

d)

Na3PO3

37.
What is the percentage of iron in iron(III)oxide?
a)
30%
b)
70%
c)
40%
d)
60%
38.
Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.
a)
 NaPO2
b)
Na2PO3
c)
Na3PO4
d)
NaPO4
39.

Which of these is NOT an empirical formula?

a)

CH2

b)

C2H5

c)

C6H4

d)

C3H7

e)

C5H17

40.

P2O6

a)

P2O6

b)

PO

c)

PO3

d)

P3O

41.

C2H6O

a)

CHO

b)

C2H6O

42.

Hg2Br2

a)

HgBr

b)

Hg2Br2

43.

What is the empirical formula for:

Mg8Si4O16

a)

MgSiO

b)

Mg2SiO4

c)

Mg4Si2O8

d)

Mg2O

44.
What is the mole ratio of H2O to H3PO4 in the following chemical equation?   P4O10 + 6 H2O --> 4 H3PO4 
a)
6:4
b)
4:6
c)
1:3
d)
3:1
45.

How many grams are in 7.8 moles of NaCl?

a)

476 grams

b)

460 grams

c)

452 grams

d)

462 grams

46.
The first step in stoichiometry is to
a)
Determine a balanced equation
b)
convert grams to moles
c)
convert grams to liters
d)
use the mole ratio
47.
2H2   +   O2  →  2H2O
How many moles of water can be produced if 8 moles H2 are used?
a)
4 moles
b)
8 moles
c)
16 moles
d)
2 moles
48.

What units are molar mass in?

a)

Moles

b)

Grams

c)

Grams per mole

d)

Atoms

49.

Calculate the molar mass of propane

C3H8

a)

13 g/mol

b)

44 g/mol

c)

99 g/mol

50.

Calculate the molar mass of ammonium sulfate

(NH4)2SO4

a)

132 g/mol

b)

130 g/mol

c)

34 g/mol

51.

How many grams of magnesium chloride are produced if 4.67 moles of HCl react?

Mg + 2 HCl --> MgCl2 + H2

a)

222 g MgCl2

b)

4.67 g MgCl2

c)

94 g MgCl2

52.

Calculate the molar mass of calcium nitrate

Ca(NO3)2

a)

164 g/mol

b)

102 g/mol

c)

80 g/mol

53.

What is the empirical formula for a compound containing 52.14% potassium, 34.81% manganese, and 13.05% oxygen?

a)

KMnO2

b)

K2MnO4

c)

K2MnO2

d)

KMnO4

54.

How many moles of water are produced when 5 moles of oxygen react with hydrogen according to the equation:

2H2 + O2 → 2H2O

a)

4 moles

b)

5 moles

c)

10 moles

d)

2.5 moles

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